Derrick



T. M. GUNN Feb. 13, 1923.

DERRICK 2 sheetsshe et 1 Fil-ed Oct. 25 1921 Jhventor; Jkozqzasfif Gunn;

Feb. 13, 1923.

1,445,136 T. M. QUNN "DERRICK Filed 0m. 25, 1 92] 2 sheets-sheet 2 Patented Feb. 13, 1923.

'UNITED STATES THOMAS M. Gunner BROOKLYN, NEW YORK.

- DERRICK.

Application filed October 25, 1921. Serial No. 510,224.

To all whom it may concern Be it known that I, THOMAS M. GUNN, a citizen of the United States, and a resident of New York, borough of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Derricks, of which the following is a specification.

This invention relates to derricks and particularly to devices of that character which are mountedon boats orbarges. The

object of my improvements is to provide a derrick suitable for use on barges, which may be erected on the deck and near a lateral edge thereof, and which may be folded down onto the barge when not in use, to permit the barge to pass under bridges and the like. A further object of my improvements is to provide a folding derrick which may be erected and folded down by one man. Other objects will appear later herein. My improvements are illustrated in their preferred embodiment in the drawings accompanying this specification, wherein Figure 1 is an end elevation of a barge on Which my improved derrick is erected. Fig. 2 is a side elevation of the upper portionof the barge on which said derrick is shown, in full lines in folded position and in dotted lines in erected position." Fig. 3 is a plan view corresponding with the elevation of Fig. 2.' Fig. 4 is a detail sectional elevation on line 44 of Fig. 2, showing the mast'support. Fig. 5 is a fragmentary sectional side view on line 55 of Fig. 4. Fig. 6 is a sectional plan view on line 66 of Fig. 1. Figs. 1, 2 and 3 are to one scale.

Figs. 4, 5 and Gare to another scale, and

which scale is about four times that of Figs. 1, 2 and 3. I I

My improved derrick includes a mast .2 pivotally mountedon pin 3 near its foot to rotate on a horizontal axis, between ears 5, 5 of step 7 mounted for rotation on a tubular member 8 having a vertical axis in bearing 9 of deck-block 22. Said horizontal axial pin 3 is preferably offset to one side of vertical axial sleeve 8, so that mast 2 isfentirely atone side of said vertical axis, for permitting hoist rope 23in its vertical run to lie in the axis of rotation of mast 2. At the top of said mast, pivot plate 10 may be similarly offset from said mast so as to present its pivotal portion 11 in line with the axis of tubular member 8 of step 7. Mast 2 isthereby mounted in parallelism with its of stud 17 lies transverse the barge. upper end of said back-leg 16 engages veraxis of rotation but eccentric thereto. Di-

rectly across the .barge'B, on side deck 12 thereof, is deck-block 14 similar to block 22 on side deck 13. On block-14 is fixed'ear 15, to which is pivoted on horizontal stud. 17, the lower end of back-leg 16. The axis The tical pivot '11 fixed to the top of mast 2. Said mast being mounted for rotation about a vertical axis, Fig. 1, and eccentric thereto, when turned to present its axial pin 3 at the foot thereof crosswise the barge, said mast and back-leg may be folded down onto the deck of the barge. Y Said 'mast is provided with the usual boom 18 pivotally mounted at its lower end between ears, as 19, of vertically adjustable block 20, slidably mounted in guideway 21 of mast 2.' Said block may belocked in any given adjusted position by lock-pin 42 thrust therethrough and into one ofa number of suitable holes, as 24, in said mast, Fig. 6, Boom 18 may'have its upper end adjustably supported from mast 2 by well known means such as tackle 25, the free end of the rope thereof being secured to cleat 26 on mast 2. Said boom is provided with the usual hoisting means 27, the hoisting rope thereof'being preferablv passed through an opening in the upper part of mast 2 and over sheave 28 pivoted in said opening.

Said sheave is of suitable diameter and locide with thte axis of rotation of mast 2.

Said rope passes downwardly through tubular base 8 of step 7, then about sheave 29 pivotally mounted in lower portion 22*? of deck-block 22, and thence horizontally to' drum 31 of hoisting engine 30, fixed to the deck'at some distance from mast 2, las shown in Figs. 2 and 3. Deck blocks 14 and'22 may be removably secured to the deck so as to permit the erection 'or removal of my improved derrick without injury to the barge. Secured to said deck is an ear 32, Figs. 1 and 5, for each of said blocks. Pivotally'connected thereto by bolt 33 is reversed ;U shaped member '34, with the top ofwhich vertical b olt'35 is in threaded engagement. Nut 36 on the top of said bolt is efficient for holding the deck block, as 22, securely to the deck. i i

Some suitable' removable means such as opposite guy. lines 37, '38 may be employed sheave ll of strut thereby providing a purchase for the final portion of the lower ing operation onto deck The operation of raising the derrick is the opposite of that just described for lowering. Strut 413 may be removed and stowed when not in use.

I claim:

1. In a device of the character described the combination or" a step mounted for rotation on. a vertical axis, a mast having its ioot pivotally mounted on a horizontal axis in said step, said mast having a pivot at its top, a back leg having its upper end in pivotal engagement with said mast top pivot and its lower end pivotally mounted on a horizontal axis remote from said step, and means for supportingsaid mast and back leg: in erected positions respectively.

2, In a device of the character described the combination of a step mounted for rotation on a Vertical axis, a mast having its toot pivotally mounted on a. horizontal axis in said step,.said mast having a pivot at its top, a back leg having, its upper end in pivotal engagement with said mast top pivot and its lower end pivotally mounted on a horizontal axis remote from said step, opposite guy lines for supporting said mast and back leg in erected positions respectively, and means for erecting and lowering said mast and back leg.

3. In a device of the character described the combination of a step mounted for rotation on a vertical axis, a mast having its foot pivotally mounted on a horizontal axis in said step, said horizontal axis being ofi'- set'lrom said vertical axis, said mast having a pivot at its top in line with the vertical axis of said step, aback leg having its upper end in pivotal enga ement withsaid mast top pivot and its lower end pivotally mounted on a horizontal axis remote from. said step, means for supporting said mast and back leg in erected positions respectively, and means for slackening said supporting means for lowering said mast and bacle leg. i

4:. In a device of the character described the combination f a step mounted for rotation on a vertical axis, an axial hole through said step, a mast having its foot pivotally mounted on a horizontal axis in said step, said horizontal axis being offset from said vertical axis, said mast having a pivot at its top in line with the vertical axis of said step, a back leg having its upper end 1n pivotal engagement with said mast top pivot and its lower end pivotally mount ed on a horizontal axis remote from said. step, and a sheave pivotally mounted in and near the top of said mast, said mast being offset form its upper pivot and from said step axis suiiiciently to permit a rope passing over said sheave to enter the axial hole in said step free of said mast.

In a device of the character described the combination of a step mounted for re-- tation on a vertical axis, an axial hole through said step, a deck-block in which said step is pivotally mounted a mast having its foot pivotally' mounted on a horizontal axis in said step, said horizontal axis being offset from saidfventical axis, said mast having a pivot at its top in line with the vertical of said step, a back leg having its upper end in pivotal engagement with said mast top pivot and its lower end pivooally mounted on a horizontal axis remote from said step, a sheave pivotally mounted in and near the top of said mast, sa id mast being'ofiset from its upper pivot and from said step axis suiiiciently to ermit a rope passing oversaid sheave to enter the axial hole in saidstep tre'eof said mast, and a sheave pivotally mounted on a horizontal axis in said deck-block below said step and having its rope-engaging periphery in line with the axis of said step. e 6. In a device of the character described the combination or" a step mounted remo t'ation, on a vertical axis, an axial hole through. said step, a deck-block in which said step is pivotally mounted,a mast hav. ing its l'oot pivotally mounted ona 'hori .zontal axis in said step, said horizontal axis being ollset from said vertical axis, said mast having a pivot-at its top in line with the vertical axis ofsaiid step, a back leg havii'lg its upper end in pivotal engagement with said mast top pivot andits lower end pivot-ally mounted on a horizontal axis re-- mote from said step, a boom having its lower end mounted on said mast, a sheave pivotally mounted in and near the top .of said mast, said mast being offset from its upper pivot and from said step axis. sufficiently to permit a rope passing over said sheave to enter the axial hole in said step free of said mast, means for supporting said mast and back leg in erected posititnis,respectively, a sheave pivotally mounted on a horizontal axis in said deck-block below said step and having: its rope-engaging periphery in line with theaxis of said step,anda rope from said boom passing over said sheave near the top of saidmast, through laid axial hole in said step and under the sheave in said declnblock. v I 7. In a device "of the character described the combination of a step mounted for rotation on a vertical axis an axial hole through said step, a deck-bloc]; lILWhlCh said 's'te i")- is mamas pivotally mounted, a mast having its feet pivotally mounted on a horizontal axis in in pivotal engagement with said mast top pivot and its lower end pivotally mounted on a horizontal axis remote from said step, a boom having -its lower end adjust-ably mounted on said mast, a sheave pivotally mounted in and near the top of said mast,- said mast being offset from its upper pivot and from said step axis sufiici-ently to permit a rope passing over said sheave to enter the axial hole in said step free of said. mast, opposite guy lines for supporting said mast and back leg in erected position and removablv connected for erecting and lowering said mast and back leg, a sheave pivotally mounted on a horizontal axis in said deckblock below said step and having its ropeengaging periphery in line with the axis of said step, and a rope from said boom pass ing over said sheave near the top of said mast .through said axial hole in said step and under the she ve in said deck-block.

8. In a device of the character described the combination of a step mounted for rota tion on a vertical axis, an axial hole through said step, a deck-block in which said step is pivotally mounted, a mast having its foot pivotally mounted on ahorizontal in said step, sald horizontal ax s being ofltset from said vertical axis, anda sheave pivot,- ally mounted on a horizontal 3X18 in said deck-block below said step and having its rope-engaging peripheryi'in line with. the

axis of said step, I v

9. In a device of the character described the combination of a step mounted for rotation on a vertical axis,:an axial hole through said step, a deck-block in which said step is pivotally mounted, a mast having itsfoot pivotally mounted on a horizontal axis in said step, said horizontal axis being offset from said vertical axis,a boomhaving its lower end mounted on (saidfrnast, a sheave pivotally mounted in and near the top of,

said mast, said mast being offset from its upper pivot andfrom said step axis suflicientlyto permit a rope passing over said sheave to enter the axial hole in said step free of said mast, a sheave pivotall'v mount ed on a horizontal axis in said deck-block below said step and having its rope-engaging periphery in line with the axis of said step, and a rope from said boom passing over said sheave near the top of said mast through said axial hole in said step and under the sheave in said deck-block,

In witness whereof, 'I hereby affix my sig-, nature this24c day of October, 1921.

THOMAS M. GUNN. p i 

